Log Files Missing and Tuning

Flew a rather sucessfull mission this weekend, need some more tuning tho. I have a few questuions :

1. I have the t-logs, that are saved automatically, but wanted to download the APM log as well. When I connect, there are NO logs. When I do a Dump 0 , there are no logs to download., any Idea whats up with this? (Had this problem before)

I have made .1 incremental changes to 'P' values, during flight, with no adverse problems.

I set up a square pattern with enough waypoints to go for 3 or 4 laps. During the flight, I make a change then observe the flight path through at least 2 corners and 2 straight legs to see if there is improvement or not. If I run out of waypoints I just hit the 'Restart Mission' button.

At this point I am only changing Nav values. (The Servo values were adjusted with FBW_A flights.)